JP2014023177A - Cam drive actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cam drive actuator capable of being easily assembled and set in the front casing 12 together with a cam body 5 and subsequently a turn-stop 62 is inserted into a shaft hole 32a, directly coupled with a rotor 3 and linked to the rotation thereof in a state that a driven shaft 6 disposed at the center of a cylindrical cam body 5 is born between a front casing 12 and a bearing member 7 located at a bottom portion 51 of the cam body 5 and an engagement piece 63 is engaged in a cam groove 531, to thereby reduce the number of component parts and simplify the assembly structure of the members to facilitate the assembly work.SOLUTION: The cam body 5 is formed of a pair of two parts including an upper cylinder 5a and a lower cylinder 5b, and is arranged to be assembled together with the driven shaft 6 having the engagement piece 63 attached and set in the front casing 12. The turn-stop 62 protruding from the bottom portion 51 of the cam body 5 is inserted rotatably forward and backward in a state being stopped rotating in the shaft hole 32a of the rotor 3. The cam body 5 is mounted on the casing body 11 being directly coupled with the rotor 3 and linked to the rotation thereof.

Description

  The present invention relates to a cam drive configured to follow a small-diameter driven shaft disposed in the center of a cylindrical cam body with an in-cylinder space so as to be movable back and forth along the shape of the cam surface. It relates to an actuator.

  Conventionally, the mechanical cam means is composed of a main shaft (motor output shaft), a cam body and a driven shaft (follower), and the cam body is a means for changing the rotational motion to a linear motion. By arranging a driven shaft on the circumference of the cam surface corresponding to the operation curve (displacement curve) and rotating the cam body to obtain the desired linear motion, the rotation of the main shaft is mechanically moved forward and backward. What converts into a displacement is known (refer patent document 1).

  This patent document 1 uses a cam body (5) having a large cylinder diameter in which the rotation of a rotor (4) is directly linked and linked, and a space in the cylinder between the cam surface (53) at the center. The driven shaft (6) having a small diameter is disposed, and a guide shaft (81a) is extended and formed on the proximal end side of the driven shaft (6), so that an insertion hole ( 41) is inserted in a non-contact manner, so that the front end side is between the bearing portion (222) of the front cap (22) and the base end side is between two points of the bearing portion (8a) of the cam body bottom portion (51). The bearing is made to function as a general motor output shaft linked to a so-called work body in which the driven shaft (6) protrudes and retracts from the bearing portion (222) (see FIG. 4). ).

  However, in this structure, the cam body (5) is integrally formed with the rotor (4), and the rotation is directly interlocked. The driven shaft (6) is connected to the bearing portion (8a) of the cam body bottom (51). When the cam body (5) having the cam groove (53a) between the upper cam surface (532) and the lower cam surface (531) is used, the cylindrical portion (52) is integrated. It is necessary to mold (refer to FIG. 5), and the engagement piece (61) is engaged with the cam groove (53a) from the state where the base end side is supported by the bearing portion (8a), and the driven shaft (6) is casing. In addition to having a structural problem that the work of assembling and setting inside is difficult, the rotational movement of the cam body (5) is transmitted to the driven shaft (6), so that the driven shaft (6) becomes a linear motion. Since the cam is driven by so-called two systems that convert, the base end bearing portion (8a) The bearing structure must allow the rotation of the cam body (5) and the forward / backward movement of the driven shaft (6). The arrangement of the bearing is restricted, and the cam body (5) is rotated at high speed. This rotational blur is acceptable for a small one, but not for a large one requiring high accuracy.

  That is, since a load is applied between the rotating cam surface (53) and the engaging piece (61) that is slidably contacted, the outer peripheral surface of the cam body (5) is slidably contacted by the holding body (72). Although it is possible to suppress rotational blur by supporting, when the work body requiring a large driving force is interlocked and connected to the driven shaft (6), the outer peripheral surface of the cam body (5) is held by the holding body ( 72), it becomes difficult to assemble and manufacture each member, such as the necessity of bearing with high accuracy, and there is a difficulty in adopting the structure as it is in a large cam apparatus.

JP 2009-144741 A

  The present invention was devised to eliminate the above-described problems, and a cylindrical cam is provided with a small-diameter driven shaft disposed in the center of a cylindrical cam body with an in-cylinder space. While driving along the cam surface of the body, the upper cylinder, the driven shaft to which the engagement piece is attached, and the lower cylinder are placed in the front casing, and the tip end of the driven shaft is the front casing front. Can be easily assembled and set in a separate process that is not linked to the rotation of the rotor, with the base end side bearing at the bottom of the cam body, and after this assembly set, The detent shaft that protrudes from the bottom of the cam body can be checked for optimal cam groove and cam drive conditions between the upper and lower cylinders divided by manual rotation. Just insert it into the shaft hole of the rotor so that it can rotate and move forward and backward. It is possible to link directly with the rotation of the rotor so that it can be easily integrated with the motor drive means, and it is easy to regulate the shaft misalignment and ensure the coaxiality during assembly. It is possible to reduce the number of parts, simplify the assembly structure of each member, simplify the production, simplify the structure, and avoid the occurrence of shaft center shake and rotational vibration of the driven shaft. It is an object to provide a simple cam drive actuator.

  The technical means adopted by the present invention in order to solve the above-mentioned problems are a stator provided with an exciting coil in a casing body, and a center disposed inside the stator so as to be rotatable by exciting the coil. A motor driving means having a rotor having a shaft hole, and a front casing forming a front side portion of the casing body, the bottom portion and a cylindrical tube portion are formed in a substantially U shape in cross-section, A cam body in which a predetermined cam surface is formed in the cylindrical portion, and a predetermined cylinder space is disposed at the center of the cam body, and is driven via an engagement piece that engages along the cam surface. A cam drive actuator comprising a follower shaft capable of moving forward and backward, wherein the follower shaft includes an output shaft portion whose front end is supported by a front casing and protrudes from the front surface thereof; Extended to the rear end The cam body is divided into a non-rotating shaft portion that is supported on the bottom portion of the cam body and protrudes from the bottom surface thereof, and the cam body is composed of an upper cylinder that forms an upper cam surface and a lower cylinder that forms a lower cam surface. As a pair, the upper cylinder is divided so that it can be used according to necessity. When the upper cylinder is used, the upper cam surface and the lower cam surface can be turned around together with the driven shaft. The annular cam groove is formed so as to be opposed to and separated from each other so that it can be assembled and set in the front casing, and the base end side of the non-rotating shaft portion protruded from the bottom of the cam body is formed in the shaft hole. By inserting the front casing into the casing body in a state where the front casing is directly linked to the rotation of the rotor, and the driven shaft is rotated. Rotate in unison with the rotation of the child One cam drive actuator, characterized by being configured to drive cams as the output shaft of the motor drive means.

The cam drive actuator according to the present invention cams a small-diameter driven shaft disposed in the center of a cylindrical cam body with an in-cylinder space along the cam surface of the cylindrical cam body. However, the upper cylinder, the driven shaft to which the engagement piece is attached, and the lower cylinder are supported in the front casing, the front end of the driven shaft is supported by the front casing front portion, and the base end side of the driven shaft is cammed. Not only can it be easily assembled and set in a separate process that is not linked to the rotation of the rotor while being supported at the bottom of the body, but the detent shaft that protrudes from the bottom of the cam body after this assembly is set. Can be checked for the optimal cam groove state and cam drive state of the upper and lower cylinders divided by manual rotation operation, and then the base end side is prevented from rotating in the shaft hole of the rotor. Simply insert the rotor so that it can rotate and move forward and backward. It can be linked directly to the motor, and can be easily integrated with the motor drive means, and can be used as a moving stroke area of the detent shaft portion inside the shaft hole. There is no need to provide a connecting stroke area by a spline or the like on the side. As a result, the cam body mounted non-rotatingly in the front casing is completely free of the need to slidably support the outer peripheral surface, and can be arranged separately in the upper and lower cylinders. Can be assembled with a bearing structure that supports both ends in advance and is rotatable and axially movable in a separate process that is not interlocked with the rotation of the rotor. It can be easily secured, the number of parts can be reduced, and the assembling structure of each member can be simplified, facilitating the manufacture and simplification of the structure of the actuator itself including the bearing structure. In addition, the driven shaft has an optimum engagement guide relationship in which a squareness is maintained without causing an engagement (sliding contact, rolling) load or axial misalignment, with the engagement piece as a non-rotating cam surface as a guide surface. Even if the engagement piece is cantilevered, it can always be guided and driven with a stable thrust, and the driven shaft can be linked to a work body that requires a large thrust, and the driven shaft can be rotated at a high speed. Even a cam device that requires a high-precision bearing structure with the following can be provided as an optimum device that avoids the occurrence of shaft center blur or rotational vibration of the driven shaft. Furthermore, the fixed cam body does not need to consider a sliding contact support structure with respect to the outer peripheral surface, and has a long stroke cam surface that simply circulates in a spiral shape by enlarging its outer diameter and extending the cylindrical portion of the groove cam. Can be easily formed, cams with various variations can be easily adopted, and optimum cam driving can be applied according to the requirements of the work body.

It is a whole longitudinal block diagram of a cam drive actuator. It is a front side view of the cam drive actuator which becomes a cam means side. It is a rear side view of the cam drive actuator used as the motor drive means side.

Hereinafter, a cam drive actuator illustrating an embodiment of the present invention as a preferred embodiment will be described in detail with reference to the drawings.
FIG. 1 is an overall longitudinal sectional view of a cam drive actuator, FIG. 2 is a front side view, and FIG. 3 is a rear side view. As shown in these drawings, reference numeral 1 denotes a cam drive actuator, and the cam drive actuator 1 is integrally constituted by a motor drive means 1a such as a hybrid stepping motor or a DC brushless motor and a cam means 1b. .

The motor driving means 1a in this embodiment includes a stator 2 (stator) as a cylindrical body having an exciting coil 22 (coiled wire), an end side portion 111 disposed on both sides of the stator 2, and a front side. And a rotor 3 that is disposed on the inner peripheral side of the stator 2 and is magnetized in the axial direction with a permanent magnet 31 interposed therebetween. The rotor 3 has a center (axial core). ) Includes a cylindrical shaft 32 disposed so as to have a shaft hole 32a. The cylindrical shaft 32 is rotatably supported by the end side portion 111 and the front side portion 112 by the bearing 4, and is rotated by excitation of the coil 22. It is configured by a so-called hybrid type stepping motor that is driven.
In addition, a cylindrical member for inserting the proximal end side of the driven shaft 6 (the anti-rotation shaft portion 62) in a non-rotating state is provided on the distal end side (the front side portion 112 side) of the shaft hole 32a. 321 is formed.

  The cam means 1b is formed into a U-shaped (concave) cylindrical shape in cross section by a disc-shaped bottom portion 51 and a cylindrical portion 52 extending in the axial direction from the outer periphery thereof. A cam body 5 on which a cam surface 53 having an undulating shape is formed, and an engagement piece 63 that is arranged with a predetermined in-cylinder space in the center of the cam body 5 and engages along the cam surface 53. And a driven shaft 6 that can be moved forward and backward, and is housed in a front casing 12 that forms a front side portion of the casing body 11.

The cam body 5 has a cross section with an insertion hole at the center of the cylinder portion 52, with the upper cylinder 5a forming the upper cam surface 53a and the lower cylinder 5b forming the lower cam surface 53b as a pair (set). The upper cam surface 53a and the lower cam surface 53b form an annular cam groove 531 that faces and separates at a predetermined interval so that the engagement piece 63 can circulate. Thus, when the cam body 5 is formed in a divided type, the upper cylinder 5a may be properly disposed according to necessity / unnecessity, and an end face cam having only the lower cylinder 5b can be easily formed. Instead of the upper cylinder 5a between the bearing member 7 and the engagement piece 63, a coil spring may be interposed so that the driven shaft 6 is always elastically biased in the backward direction, and further divided into three parts with an intermediate cylinder interposed. As a spiral groove.
Further, the upper cylinder 5a may be set on the front side in the front casing 12, and may be screw-fixed in advance from the side surface, or may be simply cylindrical. Bearing members 7 (bushings) are respectively provided at the center of the bottom 51 of the lower cylinder 5b and the center of the front casing 12, and the front casing 12 has a base end side thereof as a front side portion 112 of the motor driving means 1a. The bottom portion 51 is fitted in a state of being in surface contact, and the outer peripheral side surface extending from the bottom portion 51 is fixed with screws.

   The driven shaft 6 is formed in a cylindrical shape with a small diameter, and is supported by a bearing member 7 provided on the front surface portion of the front casing 12 so as to be rotatable and axially movable, and protrudes from the front surface of the front casing 12. The output shaft portion 61 and the rear end side of the output shaft portion 61 are formed so as to extend in a drum shape in a cross-sectional view in which the outer peripheral facing surface of the cylindrical shaft is cut into two D-shapes (arc-shaped), A bearing member 7 provided on the bottom 51 of the cam body 5 is rotatably and axially supported and is divided into a non-rotating shaft 62 having a length protruding outward from the bottom surface. Furthermore, it is comprised by the engagement piece 63 inserted and attached to the attachment hole 6a drilled in the site | part close | similar to the rotation prevention shaft part 62 used as the base end side of the output shaft part 61. As shown in FIG. The anti-rotation shaft portion 62 protruding from the bottom surface of the bottom portion 51 is inserted into the shaft hole 32a via the anti-rotation portion 321 of the cylindrical rotor 3 corresponding thereto so as to be able to rotate and advance and retreat in a non-rotating contact state. The insertion length is set to a length that does not cause insertion / dissociation even when the maximum movement stroke amount due to the undulation of the cam surface 53 is exceeded, and is directly coupled to the rotation of the rotor 3.

Note that the engagement piece 63 is disclosed in Patent Document 1 when the cylinder diameter of the cam body 5 is increased and the cam surface 53 requires an in-cylinder space between the outer peripheral surface of the driven shaft 6 and the inner peripheral surface of the cylindrical portion 52. As described above, a columnar base formed so that its outer peripheral surface is closely spaced from the cam surface 53 is divided into a region where the output shaft portion 61 and the non-rotating shaft portion 62 are separated (on the output shaft portion 61 side, the non-rotating shaft portion 62). It is also possible to provide the cam groove 531 via this base by providing it on the side or both of them. When engaged in this way, the extended length of the small-diameter engaging piece 63 can be set short, and sliding contact can be achieved with the engagement load being distributed and reduced. In this case, it is possible to reduce friction with the cam body 5 by pivotally supporting the engaging piece 63 in the mounting hole 6a. Instead of the engagement piece 63, a cam follower including a shaft portion (stud) having a roller that rolls on the cam surface 53 at the tip may be used.
As a result, the driven shaft 6 that is directly linked to the rotation of the rotor 3 is moved by the bearing member 7 between the two points of the output shaft portion 61 on the distal end side and the rotation shaft portion 62 on the proximal end side. While being guided by a bearing structure that supports both ends with high accuracy so that it can rotate and move in the axial direction, the output shaft 61 is rotated along the undulating shape of the cam surface 53 as the driven shaft 6 rotates. It functions as a motor output shaft that interlocks with a so-called work body that appears and disappears from the front surface of the casing 12.

Next, a method for assembling the cam means 1b to the motor drive means 1a will be described. First, the upper cylinder 5a is set in the front casing 12 and attached by screw fixing. The distal end side of the output shaft portion 61 of the driven shaft 6 is inserted and supported by the bearing member 7 of the front casing 12, and the engaging piece 63 is moved upward. In the state engaged with the cam surface 53a, the lower cylinder 5b is inserted into the front casing 12 while the rotation-preventing shaft part 62 base end side of the driven shaft 6 is inserted and supported by the bearing member 7 of the bottom 51 of the lower cylinder 5b. set. At this time, the cam groove 531 has a detent shaft that protrudes from the bottom 51 of the lower cylinder 5b so that the optimal facing relationship (such as making the undulating surfaces coincide) and the groove width between the upper cam surface 53a and the lower cam surface 53b. The cam drive operation and alignment are confirmed while manually rotating the portion 62, and the lower cylinder 5b is attached by screw fixing. In addition, if a guide groove is engraved on the outer peripheral surface of the cylindrical portion 52 in advance and a guide piece is provided on the inner peripheral surface of the front casing 12, the alignment operation can be easily performed.
After that, the detent shaft portion 62 protruding from the bottom 51 of the lower cylinder 5 b is inserted into the shaft hole 32 a via the detent portion 321 of the rotor 3, and is directly coupled to the rotation of the rotor 3. The assembly is completed when the base end side of the front casing 12 is externally fitted with the front side portion 112 in contact with the bottom 51 and the outer peripheral side surface is fixed with screws.

Thus, the driven shaft 6 of the cam means 1b in the assembled cam drive actuator 1 includes the bearing member 7 provided on the front surface of the front casing 12, and the bearing member 7 provided on the bottom 51 of the lower cylinder 5b. Thus, in a state in which the bearing is firmly supported and accommodated in the front casing 12, the detent shaft portion 62 is inserted into the detent portion 321 of the rotor 3 so as to be able to move forward and backward, so that the rotation of the rotor 3 is directly performed. Interlocked and moved forward and backward while rotating in the shaft hole 32a as a moving stroke region, and the engaging piece 63 is guided around the annular cam surface 53 of the cam body 5 to be provided on the front surface of the front casing 12. The bearing member 7 is rotated and moved up and down to drive the cam. In other words, the driven shaft 6 engages with the lower cam surface 53b when the cam undulation has an upward slope, and with the upper cam surface 53a when the cam undulation has a downward slope. The piece 63 circulates while being guided, and the driven shaft 6 is cam-driven as the output shaft of the motor driving means 1a.

  In the embodiment of the present invention configured as described above, the driven shaft 6 constituting the cam means 1b accommodated in the front casing 12 is now rotated by the rotor 3 of the motor drive means 1a connected thereto. The cam drive actuator 1 according to the present invention accommodates the cylindrical cam body 5 in the front casing 12 in a non-rotating manner, while being cam-driven along the cam surface 53 formed on the cam body 5. The driven shaft 6 is supported at the front end thereof by the front casing 12 and projecting from the front surface of the output shaft portion 61, and at the rear end side of the output shaft portion 61 and by the bottom 51 of the cam body 5. On the other hand, the cam body 5 is formed by being divided into a non-rotating shaft portion 62 protruding from the bottom surface, while the cam body 5 has a pair of an upper cylinder 5a that forms an upper cam surface 53a and a lower cylinder 5b that forms a lower cam surface 53b ( Pair) and Thus, the upper cylinder 5a is divided and formed so as to be selectively used according to necessity. When the upper cylinder 5a is used, the upper cam surface 53a and the lower cam surface 53b are rotated around the engagement piece 63 together with the driven shaft 6. Of the non-rotating shaft portion 62 projecting from the bottom portion 51 of the cam body 5 and being configured to be separately assembled and set in the front casing 12. The base end side is inserted into the shaft hole 32a of the rotor 3 so as to be able to rotate and move forward and backward in a non-rotating state, and the front casing 12 is connected to the casing body 11 in a state of being directly linked to the rotation of the rotor 3. The driven shaft 6 is configured to be cam-driven as an output shaft of the motor driving means 1a while rotating the driven shaft 6 integrally with the rotation of the rotor 3.

  With this configuration, the small-diameter driven shaft 6 disposed in the center of the cylindrical cam body 5 with an in-cylinder space is cam-driven along the cam surface 53 of the cylindrical cam body 5. The three members of the upper cylinder 5 a, the driven shaft 6 to which the engagement piece 63 is attached, and the lower cylinder 5 b are placed in the front casing 12, and the distal end side of the driven shaft 6 is the front portion of the front casing 12. With the bearing member 7, the base end side of the driven shaft 6 is supported by the bearing member 7 at the bottom 51 of the cam body 5, and can be easily assembled in a separate process not linked to the rotation of the rotor 3. Not only can this be set, but after this assembling and setting, the detent shaft portion 62 protruding from the bottom 51 of the cam body 5 has an optimum cam groove 531 between the upper cylinder 5a and the lower cylinder 5b divided by manual rotation. Status and cam drive status can be checked, and then the base end Can be directly linked and linked to the rotation of the rotor 3 by simply inserting it into the shaft hole 32a of the rotor 3 so that it can be rotated and moved back and forth without rotation. The motor drive means 1a can be integrated with each other, and can be used as a moving stroke area of the anti-rotation shaft portion 62 in the shaft hole 32a. In particular, a connecting stroke area by a spline or the like is provided on the front casing 12 side. There is no need.

  As a result, the cam body 5 mounted non-rotatingly in the front casing 12 does not need to be slidably supported on its outer peripheral surface, and can be arranged separately in the upper cylinder 5a and the lower cylinder 5b. Thus, only the driven shaft 6 can be assembled with a bearing structure in which both ends are supported by the bearing member 7 so as to be freely rotatable and axially movable in a separate process not linked to the rotation of the rotor 3. It is easy to regulate shaft misalignment and ensure the same degree of coaxiality during assembly, reduce the number of parts and simplify the assembly structure of each member, and simplify the structure of the actuator itself including the bearing structure. Can be achieved. In addition, the driven shaft 6 uses the engagement piece 63 as the travel guide surface with the entire width of the non-rotating cam surface 53 as the contact surface evenly on the cam surface 53, thereby engaging (sliding contact, rolling) load and shaft misalignment. The optimal engagement guide relationship that maintains the squareness is ensured without being generated, and even if the engagement piece 63 is cantilevered, it can always be guided and driven with a stable thrust, and the driven shaft 6 requires a large thrust. Even if it is a cam device that requires a high-precision bearing structure such as interlocking connection to the work body and rotating the driven shaft 6 at a high speed, the shaft shaft blurring or rotational vibration of the driven shaft 6 occurs. Can be provided as an optimal avoidance. Further, the fixed cam body 5 does not need to consider a sliding contact support structure with respect to its outer peripheral surface, and is a long stroke cam that simply circulates in a spiral shape by enlarging its outer diameter and lengthening the cylindrical portion of the groove cam. The surface 53 can be easily formed, cams with various variations can be easily adopted, and optimum cam driving can be applied according to the requirements of the work body.

  Further, in the shaft hole 32 a of the rotor 3, the rotation preventing portion 321 is provided on the inner peripheral surface on the bottom 51 side of the cam body 5, so that the rotation preventing portion 321 can be visually recognized from the front side portion 112. In addition to being able to easily perform the operation of inserting the detent shaft portion 62 protruding from the bottom portion 51 of the cam body 5, the bearing member 7 of the bottom portion 51 is disposed in close proximity to the bearing member 7 after being assembled. Rotational transmission without torque loss can be performed to the non-rotating shaft portion 62.

  Further, since the non-rotating shaft portion 62 has a length that enters the shaft hole 32a of the rotor 3 from the non-rotating portion 321, the non-rotating shaft portion 62 has a base end portion thereof when the driven shaft 6 moves forward. The anti-rotation portion 321 (cylinder shaft 32) does not enter into the anti-rotation portion 321, and the anti-rotation portion 321 is always in contact with the anti-rotation portion so that the anti-rotation portion can move forward and backward while rotating. Can be used as a moving stroke area, so that the non-rotating shaft portion 62 can be set to be long, and the stroke length setting of the cam surface 53 and the length setting of the output shaft portion 61 can be easily made. be able to.

  Further, since the engagement piece 63 is inserted and attached to a mounting hole 6a drilled in a portion close to the detent shaft portion 62 on the output shaft portion 61 base side of the driven shaft 6, the engagement piece 63 is engaged. Even if the piece 63 is cantilever-engaged with the cam surface 53 or is engaged at both ends, it can be easily switched and attached.

Further, the driven shaft 6 is provided with a columnar base (not shown) formed so that the outer peripheral surface thereof is close to and separated from the cam surface 53 in the region where the output shaft portion 61 and the non-rotating shaft portion 62 are separated. Since the engaging piece 63 is attached so as to be engaged with the cam groove 531 via this base, the diameter of the cam body 5 becomes large and the cam surface 53 needs a distance from the shaft center to the space in the cylinder. In addition, the length of the engagement piece 63 can be set short, and the sliding contact can be engaged with the load being reduced.

The driven shaft 6 is supported between the front casing 12 and the bearing member 7 provided on the bottom 51 of the cam body 5, and the engagement piece 63 is engaged between the cam grooves 531. The three members of the upper cylinder 5a, the driven shaft 6 to which the engagement piece 63 is attached, and the lower cylinder 5b can be easily assembled and set in the front casing 12, and after the setting, The rotation stop shaft portion 62 protruding from the shaft 51 is inserted into the shaft hole 32a so as to be able to rotate and advance and retreat in the rotation stop state. It can be used as a motor output shaft that is linked to the body, and can be used from small to large according to the requirements of the work body that requires high accuracy such as cam drive, large thrust, high-speed rotation, and rotation blur regulation. Applicable up to.

DESCRIPTION OF SYMBOLS 1 Cam drive actuator 1a Motor drive means 11 Casing main body 111 End side part 112 Front side part 1b Cam means 12 Front casing 2 Stator 22 Excitation coil 3 Rotor 31 Permanent magnet 32 Cylindrical shaft 32a Shaft hole 321 Anti-rotation part 4 Bearing 5 Cam Body 51 Bottom 52 Cylinder 53 Cam surface 5a Upper cylinder 53a Upper cam surface 5b Lower cylinder 53b Lower cam surface 531 Cam groove 6 Drive shaft 61 Output shaft portion 62 Non-rotating shaft portion 63 Engagement piece 6a Mounting hole 7 Bearing member

Claims (5)

Motor driving means comprising a stator provided with an exciting coil in the casing body, and a rotor having a shaft hole at the center thereof rotatably disposed by excitation of the coil;
In the front casing that forms the front side portion of the casing body, a cam body that is formed in a substantially U shape in sectional view with a bottom portion and a cylindrical tube portion, and a predetermined cam surface is formed on the tube portion, The cam means comprises a follower shaft that is disposed at the center of the cam body with a predetermined in-cylinder space and is driven via an engagement piece that engages along the cam surface. A cam drive actuator,
The driven shaft has an output shaft portion whose front end is supported by the front casing and protrudes and protrudes from the front surface thereof, a rotation extending to the rear end side of the output shaft portion and bearings on the bottom portion of the cam body and protruding from the bottom surface thereof. While configured to be divided into a stop shaft,
The cam body is formed as a pair of an upper cylinder that forms an upper cam surface and a lower cylinder that forms a lower cam surface, and the upper cylinder is divided and used according to necessity. The upper cam surface and the lower cam surface are separated from each other so as to form an annular cam groove that allows the engagement piece to rotate with the driven shaft, and can be assembled and set in the front casing.
The base end side of the non-rotating shaft protruding from the bottom of the cam body is inserted into the shaft hole so as to be able to rotate and move forward and backward in a non-rotating state, and directly linked to the rotation of the rotor. By attaching the front casing to the casing body in the
A cam driving actuator configured to drive the driven shaft as an output shaft of motor driving means while rotating integrally with the rotation of the rotor. 2. The cam driving actuator according to claim 1, wherein a detent portion is provided in an inner peripheral surface on the bottom side of the cam body in the shaft hole of the rotor. 3. The cam drive actuator according to claim 2, wherein the non-rotating shaft portion has a length that enters the shaft hole of the rotor from the non-rotating portion. 4. The cam drive actuator according to claim 1, wherein the engagement piece is inserted into and attached to a mounting hole formed in the driven shaft. 5. The cylindrical base plate according to claim 1, wherein the driven shaft is provided with a columnar base formed in a region where the output shaft portion and the detent shaft portion are separated so that an outer peripheral surface thereof is close to and separated from the cam surface. The cam drive actuator is provided, wherein the engagement piece is attached to be engaged with the cam groove via the base.